package com.example.mq.mqclient;

import com.example.mq.common.*;
import com.example.mq.mqserver.core.BasicProperties;
import com.example.mq.mqserver.core.Consumer;
import com.example.mq.mqserver.core.ExchangeType;
import com.sun.org.apache.regexp.internal.RE;
import lombok.AllArgsConstructor;
import lombok.Data;

import java.io.IOException;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.ConcurrentHashMap;
@Data
public class Channel {
    private String channelId;
    //当前channel属于哪个连接
    private Connection connection;
    //记录后续客户端收到的服务器的响应
    private ConcurrentHashMap<String, BasicReturns> basicReturnsMap = new ConcurrentHashMap<>();
    //如果当前Channel订阅了某个队列 就需要在此处记录下对应回调是啥,当该队列的消息返回来的时候,调用回调
    //此处约定一个Channel中只能有一个回调
    private Consumer consumer = null;

    public Channel(String channelId, Connection connection) {
        this.channelId = channelId;
        this.connection = connection;
    }

    //在这个方法中 和服务器进行交互 告诉服务器 此时客户端创建了新的channel
    public boolean createChannel() throws IOException {

        //对于创建Channel操作来说 payload就是一个basicArguments对象
        BasicArguments arguments = new BasicArguments();
        arguments.setChannelId(channelId);
        arguments.setRid(generateRid());
        byte[] payload = BinaryTool.toBytes(arguments);

        //构造type = 0x1的对象
        Request request = new Request();
        request.setType(0x1);
        request.setLength(payload.length);
        request.setPayload(payload);

        //发送请求
        connection.writeRequest(request);

        //等待服务器的响应
        BasicReturns basicReturns = waitResult(arguments.getRid());
        return basicReturns.isOk();
    }

    //用这个方法来阻塞等待服务器的响应
    private BasicReturns waitResult(String rid) {
        BasicReturns basicReturns = null;
        while ((basicReturns = basicReturnsMap.get(rid)) == null) {
            //如果查询结果为null 说明包裹还没有回来
            //此时就需要阻塞等待
            synchronized (this) {
                try {
                    wait();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
        //读取成功后 把消息从哈希表中删除掉
        basicReturnsMap.remove(rid);
        return basicReturns;
    }
    public void putReturns(BasicReturns basicReturns) {
        basicReturnsMap.put(basicReturns.getRid(),basicReturns);
        synchronized (this){
            //当前也不知道多少线程在等待上述的这个响应
            //把所有的等待线程都唤醒
            notifyAll();
        }
    }

    private String generateRid() {
        return "R-" + UUID.randomUUID();
    }

    //关闭channel 发送type = 0x2
    public boolean close() throws IOException {
        BasicArguments basicArguments = new BasicArguments();
        basicArguments.setRid(generateRid());
        basicArguments.setChannelId(channelId);
        byte[] payload = BinaryTool.toBytes(basicArguments);

        Request request = new Request();
        request.setType(0x2);
        request.setLength(payload.length);
        request.setPayload(payload);

        connection.writeRequest(request);
        BasicReturns basicReturns = waitResult(basicArguments.getRid());
        return basicReturns.isOk();
    }

    //创建交换机
    public boolean exchangeDeclare(String exchangeName, ExchangeType exchangeType, boolean durable, boolean autoDelete,
                                   Map<String, Object> arguments) throws IOException {
        ExchangeDeclareArguments exchangeDeclareArguments = new ExchangeDeclareArguments();
        exchangeDeclareArguments.setRid(generateRid());
        exchangeDeclareArguments.setChannelId(channelId);
        exchangeDeclareArguments.setExchangeName(exchangeName);
        exchangeDeclareArguments.setExchangeType(exchangeType);
        exchangeDeclareArguments.setDurable(durable);
        exchangeDeclareArguments.setAutoDelete(autoDelete);
        exchangeDeclareArguments.setArguments(arguments);
        byte[] payload = BinaryTool.toBytes(exchangeDeclareArguments);

        Request request = new Request();
        request.setType(0x3);
        request.setLength(payload.length);
        request.setPayload(payload);

        connection.writeRequest(request);
        BasicReturns basicReturns = waitResult(exchangeDeclareArguments.getRid());
        return basicReturns.isOk();
    }

    //删除交换机
    public boolean exchangeDelete(String exchangeName) throws IOException {
        ExchangeDeleteArguments exchangeDeleteArguments = new ExchangeDeleteArguments();
        exchangeDeleteArguments.setRid(generateRid());
        exchangeDeleteArguments.setChannelId(channelId);
        exchangeDeleteArguments.setExchangeName(exchangeName);
        byte[] payload = BinaryTool.toBytes(exchangeDeleteArguments);

        Request request = new Request();
        request.setType(0x4);
        request.setLength(payload.length);
        request.setPayload(payload);

        connection.writeRequest(request);
        BasicReturns basicReturns = waitResult(exchangeDeleteArguments.getRid());
        return basicReturns.isOk();
    }

    //创建队列
    public boolean queueDeclare(String queueName, boolean durable, boolean exclusive, boolean autoDelete,
                                Map<String, Object> arguments) throws IOException {
        QueueDeclareArguments queueDeclareArguments = new QueueDeclareArguments();
        queueDeclareArguments.setRid(generateRid());
        queueDeclareArguments.setChannelId(channelId);
        queueDeclareArguments.setQueueName(queueName);
        queueDeclareArguments.setDurable(durable);
        queueDeclareArguments.setExclusive(exclusive);
        queueDeclareArguments.setAutoDelete(autoDelete);
        queueDeclareArguments.setArguments(arguments);
        byte[] payload = BinaryTool.toBytes(queueDeclareArguments);

        Request request = new Request();
        request.setType(0x5);
        request.setLength(payload.length);
        request.setPayload(payload);

        connection.writeRequest(request);
        BasicReturns basicReturns = waitResult(queueDeclareArguments.getRid());
        return basicReturns.isOk();
    }

    //删除队列
    public boolean queueDelete(String queueName) throws IOException {
        QueueDeleteArguments arguments = new QueueDeleteArguments();
        arguments.setRid(generateRid());
        arguments.setChannelId(channelId);
        arguments.setQueueName(queueName);
        byte[] payload = BinaryTool.toBytes(arguments);

        Request request = new Request();
        request.setType(0x6);
        request.setLength(payload.length);
        request.setPayload(payload);

        connection.writeRequest(request);
        BasicReturns basicReturns = waitResult(arguments.getRid());
        return basicReturns.isOk();
    }

    //创建绑定
    public boolean queueBind(String queueName, String exchangeName, String bindingKey) throws IOException {
        QueueBindArguments arguments = new QueueBindArguments();
        arguments.setRid(generateRid());
        arguments.setChannelId(channelId);
        arguments.setQueueName(queueName);
        arguments.setExchangeName(exchangeName);
        arguments.setBindingKey(bindingKey);
        byte[] payload = BinaryTool.toBytes(arguments);

        Request request = new Request();
        request.setType(0x7);
        request.setLength(payload.length);
        request.setPayload(payload);

        connection.writeRequest(request);
        BasicReturns basicReturns = waitResult(arguments.getRid());
        return basicReturns.isOk();
    }

    //解除绑定
    public boolean queueUnbind(String queueName, String exchangeName) throws IOException {
        QueueUnbindArguments arguments = new QueueUnbindArguments();
        arguments.setRid(generateRid());
        arguments.setChannelId(channelId);
        arguments.setQueueName(queueName);
        arguments.setExchangeName(exchangeName);
        byte[] payload = BinaryTool.toBytes(arguments);

        Request request = new Request();
        request.setType(0x8);
        request.setLength(payload.length);
        request.setPayload(payload);

        connection.writeRequest(request);
        BasicReturns basicReturns = waitResult(arguments.getRid());
        return basicReturns.isOk();
    }

    //发送消息
    public boolean basicPublish(String exchangeName, String routingKey, BasicProperties basicProperties, byte[] body) throws IOException {
        BasicPublishArguments arguments = new BasicPublishArguments();
        arguments.setRid(generateRid());
        arguments.setChannelId(channelId);
        arguments.setExchangeName(exchangeName);
        arguments.setBasicProperties(basicProperties);
        arguments.setRoutingKey(routingKey);
        arguments.setBody(body);
        byte[] payload = BinaryTool.toBytes(arguments);

        Request request = new Request();
        request.setType(0x9);
        request.setLength(payload.length);
        request.setPayload(payload);

        connection.writeRequest(request);
        BasicReturns basicReturns = waitResult(arguments.getRid());
        return basicReturns.isOk();
    }

    //订阅消息
    public boolean basicConsume(String queueName, boolean autoAck, Consumer consumer) throws MqException, IOException {
        //先设置回调
        if (this.consumer != null) {
            throw new MqException("该channel已经设置过消费信息的回调了 不能重复设置");
        }
        this.consumer = consumer;

        BasicConsumeArguments arguments = new BasicConsumeArguments();
        arguments.setRid(generateRid());
        arguments.setChannelId(channelId);
        arguments.setConsumerTag(channelId);//consumerTag 也是用channelId来表示了
        arguments.setQueueName(queueName);
        arguments.setAutoAck(autoAck);
        byte[] payload = BinaryTool.toBytes(arguments);

        Request request = new Request();
        request.setType(0xa);
        request.setLength(payload.length);
        request.setPayload(payload);

        connection.writeRequest(request);
        BasicReturns basicReturns = waitResult(arguments.getRid());
        return basicReturns.isOk();
    }

    //确认消息
    public boolean basicAck(String queueName, String messageId) throws IOException {
        BasicAckArguments arguments = new BasicAckArguments();
        arguments.setRid(generateRid());
        arguments.setChannelId(channelId);
        arguments.setQueueName(queueName);
        arguments.setMessageId(messageId);
        byte[] payload = BinaryTool.toBytes(arguments);

        Request request = new Request();
        request.setType(0xb);
        request.setLength(payload.length);
        request.setPayload(payload);

        connection.writeRequest(request);
        BasicReturns basicReturns = waitResult(arguments.getRid());
        return basicReturns.isOk();
    }



}
